Locomotive-boiler.



PATENTED 001:29. v1907.- s. A. RBBVE. LoGoMoTIvE BOILBR.

APPLIQATION FILED DE0.Y17.` 1906.

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,rrNr-Tno STArES eAEnT,

SIDNEY A. REEVE, oF

WORCESTER, MASSACHUSETTS, ASSIGNOR To CHARLES "ii BROWN, TRUSTEE, CF READING, MASSACHUSETTS.

LoooMoTIvE-BOILER.

l 799,265 and 803,788, describing a construction in which the'combustion gases pass from the fire-box, successively over an evaporating surface., a superheating surface and a feed-heating surface on their Way to the stack. As' there dcscibed the gases were compelled to pass three times tlie length of the boiler. making it difficult to avoid restricting the draft, and also entailing certain complications of construction and operation which l non' aim to do away with.

The main objects of the presentinvention are to decrease the length of travel ofthe gases and th'e rcstriction of the draft, to render the heating-surfaces more readily accessible for cleaning and repairs, to simplify the structure ofthe main shell, to increase and concentrate the superheating-surface, and to effect other use. ful results as will more fully appear.

Of the accompanying drawings. Figure .l represents a longitudinal 'section of a locomotive boiler constructed according to my invention. Figs. 2. 3, and 4 represent transverse sections thereof on the correspondinglynumbered lines of Fig. l.

The same reference characters indicate the "same parts in all the views. V

ln the drawings, l0 indicates th o main barrel or body of the boiler embodying an outer pressure-remining shell with a furnace or fire-box l] at. the rear end and a gas-chamber 12 at the forward end which takes the place of theusual smoke-box as regards its location. A single transverse tube-sheet 13 separates the interior of the chamber l2 and the pressure-retaining shell l() and forms a forward terminus for the ends'of all the firetubes. These tubes are composed of a set of vaporizingtubes 14 having their rear terminus in the front tube- Shcetof the furnace ll and a set of preheating or feedheating tubes 15 which looked at endwise, form a substantially U-shaped group embracing the vaporizing tubes as shown in Fig. 2. their terminus in a tube-sheet 1G which is located forward of the rear termination` of the vaporizing-tubes 14 and forms the front wall of a rear gas-chamber 50l 17 having a stack or gas-discharge outlet 18. The wall of the vaporiZing-chamber where it traverses this rear gas-chamber is of reduced diameter' and is embraced or surrounded by said gas-chamber. lts sides at this point are flattened as indicatedat 19 in Fig. 3 in order The 'preheating-tubcs have v Specification of Letters Patent Application filed December 17- 1906. Serial No. 348.104-

Patented oct. 29, 1907.

to give additional space for the location of preheatingtubes and I provide cast buttresses'20 of segmental` form7 to truss orbrace these flat portions withinpthe rear gas-chamber 17. The reduced inner shell just mentionediis continued within the pressure-space, forward ol the tube-sheet 16, as a partition 21 which divides the interior of the`barrel into a vaporizing-compartment 22 containing the vaporiZing-tubes 14, and a preheating-compartment 23 which containsthe `preheating-tubes 15 and embraces said vaporizing-compartment.. The upper part of this partiton is pierced at 24, 25 to give the two compartments a common steam-space, and feed-water which is supplied to the preheater by wayoi an inlet 26 overflowsinto the vaporiZing-compartment through the lowermost hole` or holes 25. 1t will be seen that this construction locates the preheater mainly at the sides of and belowv t-he vaporizer, but this only represents one of a number of ways in whichv the two chambers may be related without departingvfrom the general arrangement described. g v 27 is asteam-dome on the main shell located just forward of the smoke-stack 18 arid containing a throttlevalve 28 at the entrance to a dry-pipe 29 which terminates in a manifold 30 in the upper part of the forward gas-chamber 12. In the lower part of said gas-chamber are two parallel receiving manifolds 31 communicating with the steam-chests 32 of the engine by the passages 33 and these lower manifolds are connected with the upper manifold 30 by two groups of flat superheating-eoils 34 whose main convolutions are located above the level of the superheating-tubes 15 so as not to interfere with free access to the forward ends of said tubes through the front end of the gas-chamber l2 which has a removable end-cover 35 like an ordinary locomotive smoke-box, to open up its interior. The superheating-coils are attached to the manifolds by removable couplings and the arrangement may be such that any individual coil may be replacediwithout disturbing the others, or the whole superheater may be removed longitudinally by uncoupling the manifolds.

The gases emerge from the forward ends of the vaporizing-tubes 14 into a gas-box 36 within the gas-chamber 12 and out among the superheater-coils through an opening 37 at the rear end of said gas-box. The gases pass forwardly among the upper convolutions of the superheater over two horizontal baffles 38 (Fig. 2), and thence return and enter the forward ends of the preheating-tubes l5 through which they pass into the rear gas-chamber 17 and out of the stack 18. y The gases are impelled by means of exhaust steam from the engine which is carried from the exhaust passages 39 through a rearwardly-extending horizontal pipe 40 to a pair of lblast-nozzles 41 located on opposite sides of the vaporizing-charnber inthe/rearV gaschamber 17. This eXhaust-pipewhere it traverses the ,preheating,compartment serves to impart some heat to the colder water in the lower part of said compartment and lWhere the peheater .section of said `pipe joinsI the forward gas? b d h i t 1th d chamber section is a suitable expansionA joint 42.` .The mcmg an av ng a common s eam'space W sa! gas-box 36 is provided with Va removable cover 1:3 at its forward end to give access to the interior thereof andato the interior endsof the Vaporizing-tubes 14. l

The locomotive boiler above-described embodies the advantages of the boiler shown in my prior patents butv heating-surfaces may be reached and cleaned through the forward end of the boiler. An incidental advan tage is secured in locating the smoke-stack at the rear end of the boiler' where the smoke and steam will afford less of an obstruction to the vision of the engineen It will be noted that the lower partici Athe heavy outer boiler-shell is extended across the rear gas-chamber 17 to the iront wall or water-leg of the'iire-'box ll to form a. stay 44 which also acts as the lower wall of said gaschamber. This heavy stay is employedl partly because of the narrowing of the pressure-chamber at the point embraced by the gas-chamber 17 v To merely iormthe gas-chamber wall a heavy sheet is not required, but for bracing purposes a stout stay is desirable. l may therefore separate the wall and stay functions and assign them to ditierent'members.

1. A locomotive-type .boiler comprising a furnace, a vaporizing-chamber, a.preheating-chamber embracing said vaporif/,ng-chamber and having a common stearnspace' therewith, tire-tubes traversing said vaporizing and preheating chambers and forming respectively an outward and a return gas-course, a means for discharging ythe gases, a gaschamber at the forward cnd or' the boiler connecting the vaporizing and preheating tubes, and :1 steam-superheaterv located in said .forward gus-chamber.

2. A locomotivc-type boiler comprising a tubular pressure-retaining shell, a vuporizingchaxnber therein, a preheating-chamber therein embracing and having a common steam-space with said vaporizing-chamber, retubes trav ersing the said chambers and forming outward and return passages for the gases, a gas-chamber at the forward end f seance tubes, and `a steamsuperheater located in said gas-chambers out of line with the lire-tubes so as to permit access to the ends of said tubes. l e

'3. A locomotive-type boiler comprising a tubular shell, a vaporizing-chamber therein, :i preheating-charnber therein ya'porizingchaxnber, and located mainly in the lower part ot the 'tubular shell, a gas charnber in line with the shell located forward ot' said vaporizing and `preheating chamand composed of a series of superheating-vsections located mainly in the upper part of the gas-chamber out of line with the retubesl 4. A locomotive comprising a furnaceha water-vaporizer heated thereby, achamber for the furnace gases embracing said vaporizer and comprising portions on opposite sides thereof, an engine, and two blast-devices' located in the respective portions'ot said chamber and supplied by the engine exhaust, for inipelling the furnace gases.

5. A locomotive having a furnace at the :rear end, a forwardly extending vaporizer heated by said* furnace, 'a chamber for the furnace gases` embracing said vapor'izer adjacent the furnace and having a discharge outlet, an en- "gine, and a plurality of-blast-devices located in said gaschamber on opposite sides of the vaporizer and supplied by the engine exhaust. i L

6. A locomotive-type boiler comprising a Water-preheatng chamber', a water-vaporizing chamber embraced by and projecting beyond the end v'of said prelieating-chamber and having a flattened wall on its projectingportion, and a segmental butLress-stay foi-reinforcing the flattened por tion of said Wall..

7. A locomotive-type boiler comprising a gas-chamber, vaporizing and preheating fire-tubes ,leading respectively into and out of said chamber, an inner gas-box including the ends of the vaporizing-tubes and having an opening into the outerI portion olsaid gaschamber, :ind o. series of superhea'ti'ngy elements located ofthe gas-chamber.

8. .A locomotive comprising a boilerstructure having an engine at the forward end, a gasldischarge outlet at thcv rear end, and an intermediate water-preheater, a gas-chamber at the forward endl of said boiler-structure, an exhaustpipe leading from the engine through said forward gaschamber' und the preheatervto the-rear gas-chamber, and an expansiomjoint connecting the sections 'of said pipe which occupy the iol-ward gaschamber and the preheater,

respectively.

9. ,A locomotive-type boiler having a furnace, vaporizing andpreheating chambers both subject to the boiler pressure, a gaschamber between the preheatingchamber and the furnace, and a stay crossing the zone of said gaswithin said outer portion chamber and connecting the Wall of the preheating-chani- Y 

